Japan remains on high alert after a powerful 7.7 magnitude earthquake struck off its northeastern coast on April 20, prompting tsunami warnings and mass evacuations. Authorities say the risk of a stronger quake in the coming days is higher than usual, raising concerns across the region.

The earthquake occurred offshore near Iwate prefecture, about 530 kilometers north of Tokyo. According to the Japan Meteorological Agency, the quake hit at a depth of around 10 kilometers and triggered warnings of tsunami waves up to 3 meters. However, the largest waves recorded reached about 80 centimeters. Alerts were lifted later the same day after conditions stabilized.

Evacuations and Disruptions Across Coastal Regions

More than 170,000 residents in parts of Honshu and Hokkaido were ordered to evacuate to higher ground. Emergency systems urged people to stay away from coastal and riverside areas as a precaution.

Public transport faced temporary disruption, including bullet train services, while about 100 homes reported power outages. Government officials confirmed there were no immediate reports of major damage or casualties. Train operations resumed later in the evening.

Authorities Warn of Stronger Quakes Ahead

The Japan Meteorological Agency stated that earthquakes with stronger shaking could occur within the next week. Officials noted that the likelihood of a quake exceeding magnitude 8.0 is currently higher than under normal conditions.

Japan lies along the Pacific Ring of Fire, making it one of the most earthquake-prone countries in the world. It experiences around 1,500 earthquakes annually, accounting for about 10% of global quakes measuring magnitude 6.0 or higher.

Memory of 2011 Disaster Shapes Response

The latest warnings have revived memories of the 2011 Tōhoku earthquake and tsunami, which killed more than 18,000 people and triggered a nuclear crisis at the Fukushima Daiichi Nuclear Power Plant.

Officials continue to urge vigilance, emphasizing early evacuation and preparedness as key measures to reduce risk.